Process and device for simulated moving bed separation with a reduced number of large diameter valves

US20080121586A1Inactive Publication Date: 2008-05-29INST FR DU PETROLE
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
INST FR DU PETROLE
Publication Date
2008-05-29
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention concerns a simulated moving bed (SMB) separation device and process comprising a column, beds Ai of adsorbent separated by plates Pi with a single distribution and extraction network for fluids, in particular feed F, desorbant D, raffinate R and extract E, and a plurality of two-way valves for distribution of said fluids, said valves being limited in number and in particular with dimensions that are smaller than in the prior art. According to the invention, the column is divided into a plurality of sectors Sk with 2 superimposed plates, each sector Sk comprising an external principal bypass line Lk connected to each plate Pi of Sk via a large diameter plate valve Vi and an external secondary bypass line Mk comprising a small diameter valve VMk connected to the adjacent sector Sk−1. Each line Lk comprises a flow limitation means, and is connected to each of the fluid networks F, D, R, E via a single large diameter valve for sequential supply or withdrawal of the corresponding fluid F, D, R or E to or from the sector Sk under consideration.
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Description

FIELD OF THE INVENTION

[0001] The invention relates to the field of separation of natural or chemical products which are difficult to separate by distillation. A family of processes and associated devices is used which are known as “chromatographic” or “simulated moving bed” or “simulated counter-current” or “simulated co-current” separation devices which we shall hereinafter term “SMB”.

[0002] A non-exclusive list of the fields concerned is:

[0003] separation of normal paraffins from branched paraffins, naphthenes and aromatics;

[0004] olefin / paraffin separation;

[0005] separation of para-xylene from other isomers in C8 aromatics;

[0006] separation of meta-xylene from other isomers in C8 aromatics;

[0007] separation of ethylbenzene from other isomers in C8 aromatics.

[0008] In addition to the refinery and petrochemicals plant, there are may other applications, including glucose / fructose separation, the separation of positional isomers of cresol, optical isomers, etc.PRIOR ART

[0009] SMB chromatograp...

Claims

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